02/18/21
Message Overview:
Message Name:
NO LB-RIU-7 BUS OUTPUT
Message Code:
B3-007797
Associated CAS:
| Reporting LRU: | RIU 1 |
| System Description: | 23-00-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
LB-RIU-7 is reported missing at L-NAV-ADF/VIR and L-DME.
Possible Causes:
- Radio Interface Unit (RIU)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Fault Confirmation Procedure:
- Message# = 17
- Comp Id = A017
- Fault Logged = AIR, TAXI
- Status = FAILED/WIRING
- {Term Definitions}
- NAV1-9 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057V: 14; NO LB-RIU-7 BUS INPUT
- RIU1-26 1X 351 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 351: 20; NO L-GP-1 INPU
- NAV1-3 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057A: 14; NO LB-RIU-7 BUS INPUT
- DME1-3 1X 057 01 EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 057: 14; NO LB-RIU-7 BUS INPUT
Quick Links:
| Removal of the Radio Interface Unit (RIU) | AMM 23-51-21-000-801 |
| Installation of the Radio Interface Unit (RIU) | AMM 23-51-21-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Suspect RIU output or wiring. ADD L-GP-1 absent logic to equation.